Communication method and device for reducing data transmission interruption during handovers

A communication method and a device for reducing data transmission interruption during handovers are provided. The method includes: receiving instruction information, where the instruction information is used to instruct user equipment to establish and/or maintain uplink synchronization of the user equipment with a first cell controlled by a first base station; when the user equipment is in uplink synchronization with the first cell according to the instruction information, the user equipment is in a radio resource control RRC connected state, and a serving cell of the user equipment is a second cell controlled by a second base station; and handing over the user equipment from the second cell to the first cell that is in uplink synchronization with the user equipment, and performing communication based on the first cell.